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Buell Motorcycle Forum » XBoard » Buell XBoard Archives » Archive through July 19, 2009 » Put holes in the airbox, loss of power under 3250 rpm « Previous Next »

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Nextcorner
Posted on Thursday, July 16, 2009 - 09:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I have a 2003 XB9R, K&N filter, Jardine exhaust. I put about 15 holes in my inner airbox, took out my snorkel, and put some holes in the outer airbox cover (same spot that the newer XB outer airbox cover has). I noticed I have less power under 3250 rpm. Midrange seems to have a little improvement, and the top rpm range has improved enough to really notice. I just received my ecmspy cable today and will try it out after work. Do I need a bit more fuel on the low and mid rpm range?
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Firstfamily
Posted on Thursday, July 16, 2009 - 10:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

My buddy has an 06 XB12S with a drummer exhaust that we just drilled out the air box in yesterday. Said it made a huge difference in power. Your bike might be running a little lean if nothing has been adjusted and could cause the loss of power under 3250. I have heard that the combo of drilling the air box and a k&n filter can cause them to run lean.
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Nextcorner
Posted on Thursday, July 16, 2009 - 10:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

When adding fuel to my map, what is a good starting point as far as a percentage to add. Should I start with adding 2% of the current value to my low-end (my problem area where i have loss of power)?
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Midknyte
Posted on Thursday, July 16, 2009 - 10:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I have heard that the combo of drilling the air box and a k&n filter can cause them to run lean.

The filter alone will make it start to run lean.

Have you taken it out and given the ecm a chance to recalibrate (running it [I think] at 3500 to 4500 rpm for about 10 or 15 minutes straight.)?
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Swordsman
Posted on Thursday, July 16, 2009 - 10:17 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Next, I got the same thing when I did mine. Didn't notice at that particular rpm, but it would seriously bog down when starting off from a stop (mine's an '06, so there's probably some mapping differences between us, and I still run the stock filter). I added 2 or 3% to the lower rpm's at the <20% throttle range, and it definitely helped. Still not perfect, but better. I need to do a full blown datalog run to see if I can get it back to normal.

~SM

(Message edited by Swordsman on July 16, 2009)
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Darthane
Posted on Thursday, July 16, 2009 - 10:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Buy the newer cover - there is a cone molded into it to help direct airflow into the velocity stack (in addition to holes to allow more airflow into it).
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Nextcorner
Posted on Thursday, July 16, 2009 - 11:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

My goal is to get some more power without spending money. So far, $10 on my ecm cable. The new cover won't solve my problem. I am currently getting more air than I did without the holes. I should have close to the same airflow as the new box. I know that it has a better airFLOW pattern, but either way, I'm getting more air than I did before.
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Darthane
Posted on Thursday, July 16, 2009 - 02:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

-=shrugs=- The new cover may not solve your problem, but it will make a difference. That little cone ain't there just because it looks good, and there's a reason they all have them now.

In general, you can't get something for nothing, with bikes or anything else. ; )
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Ourdee
Posted on Thursday, July 16, 2009 - 05:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Darthane, I think he's fixated on the problem right now. Later he will remember the cone when he wants some more power. Finding a flat spot always gets my attention.
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Glitch
Posted on Thursday, July 16, 2009 - 06:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Did you ride enough for the ECM to learn about the changes you've made?
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Nextcorner
Posted on Thursday, July 16, 2009 - 07:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Darthane,

Understand your point. Just don't have extra money right now. Eventually I'll change over the airbox, but i'm trying to get some more without it.
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Wavex
Posted on Friday, July 17, 2009 - 12:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

It always amazes me when ppl hack their airbox and think they'll improve performance and be able to fine tune the FI map just by using their butt dyno... imho you guys are crazy! : )
Either leave it alone or spend the money to get a proper dyno shop to tune your bike for your setup!


On a side note:
http://farm4.static.flickr.com/3297/3617025832_ba2deb417b_b.jpg

(Message edited by wavex on July 17, 2009)
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Iamarchangel
Posted on Friday, July 17, 2009 - 03:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Gotta agree with Wavex on this one. I have no problem with arguing with design and engineers, it's just that this is math. "They" stopped that calculations at a certain point for certain reasons. People really need to have a grasp of the formulas involved.

Why 15 holes? 13 holes may have been the optimum and now you'll never know.
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Nextcorner
Posted on Friday, July 17, 2009 - 05:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

So why do places like AmericanSportbike even make and obviously sell plenty of the open airbox conversion kits? Also, the outer airbox with huge CIA vents?
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Nextcorner
Posted on Friday, July 17, 2009 - 05:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Drilling holes is not too far off from having an 07 airbox.
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Metalstorm
Posted on Friday, July 17, 2009 - 06:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

The open airbox kit has the inverted nipple as well.

It really is that important : )

Edit: The nipple doesn't change the amount of air the engine receives. It just changes the flow of the air which changes how the engine responds and the engine responds very, very well to it.

(Message edited by Metalstorm on July 17, 2009)
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Nextcorner
Posted on Friday, July 17, 2009 - 06:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Just ordered it. $35 is pretty cheap.
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Teddagreek
Posted on Friday, July 17, 2009 - 07:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

What was wrong with the Original design once you desnorkel/K&N it?


You start pulling in all that hot air too once you switch to the newer air box...


Some one had the original air box covered in a insulation, with the tank cover sandwiched over it?
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Metalstorm
Posted on Friday, July 17, 2009 - 07:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

What was wrong with the Original design once you desnorkel/K&N it?

03-04 9s didn't come with the inverted nipple inner air box cover.

They suffered from a stumble at a certain rpm.

It was discovered that replacing it with one from a 12 which had the inverted nipple smoothed out the air delivery and pretty much eliminated said stumble. There was even a tiny little gain in hp. : )

In 05 the 9's came stock with the inverted nipple cover.

Upgrading a pre-05 9 to the 12 inner cover was/is arguably the best mod one could/can do.

For $35, you get your money's worth. : )
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Teddagreek
Posted on Friday, July 17, 2009 - 08:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I know that part of the story..

My 05 came with the nipple but it was still swiss cheesed?


I have a 08 air-box now and a 09 white tank cover..

The breather through the tank was such a well thought out Idea and you don't pull the hotter air..
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